These are the standard sizes of beds today and the physical measurements can very slightly from brand to brand. Keep in mind the mattress height or depth, some can make your bed much taller than it currently is and also make it a challenge to find sheets that fit.
|Twin (extra long)||39″x 80″
(two twin extra longs will make a King size)
|Three Quarter (antique beds)||48″ 72″|
|Olympic Queen||66″x 80″|
|King Size||78″x 80″|
|California King||72″x 84″|